Amines
REACH
4,4'-methylenebis(cyclohexylamine)
CAS Number
1761-71-3
EC Number
217-168-8
Abbreviation
PACM
What is 4,4'-methylenebis(cyclohexylamine)?
4,4'-Methylenebis(cyclohexylamine) (CAS 1761-71-3), commercially known as PACM, is a cycloaliphatic diamine used as a curing agent and crosslinker in high-performance polymer systems.
Where is 4,4'-methylenebis(cyclohexylamine) used?
- Epoxy coatings: curing agent for automotive topcoats, industrial flooring and marine finishes where yellowing resistance matters
- Adhesives and sealants: flexible, durable bonds in structural assemblies exposed to thermal cycling and harsh conditions
- Monomer building block: reacted with diacids or diisocyanates to produce polyamides and polyureas with elevated glass transition temperatures and chemical resistance
- Engineering plastics: PACM-based polyamides processed into transparent or translucent components requiring toughness and optical clarity
- It delivers cured networks with strong mechanical properties and good UV stability.
Commercial specifications
- Technical and high-purity grades
- Drums and IBC containers; bulk supply for high-volume procurement
Other Names (Synonyms)
4,4'-methylenebiscyclohexanamin|4,4-diaminodicyclohexylmethane|4,4'-Methylenedicyclohexanamine|Bis(4-aminocyclohexyl)methane|Wandamin HM|Cyclohexanamine, 4,4'-methylenebis-|Bis(p-aminocyclohexyl)methane|PACM 20|PACM
What are the physical properties of 4,4'-methylenebis(cyclohexylamine)?
Melting Point 39.6 °C
Boiling Point 127-133 °C @ Press: 0.3-0.6 Torr
Density 0.9380 g/cm³ @ Temp: 60 °C
Flash Point >230 °F
Color White or Colorless to Almost white or Almost colorless
Odor Ammonia odor
Form powder to lump to clear liquid
Water Solubility Insoluble (<0.1 g/100 mL)
Vapor Pressure <0.1 mm Hg ( 38 °C)
Refractive Index 1.5032 (estimate)
Log P 2.03 at 25℃
How is 4,4'-methylenebis(cyclohexylamine) classified and handled safely? Learn More
Danger
GHS05· Corrosive GHS06· Toxic GHS07· Irritant GHS08· Health Hazard GHS09· Environmental Hazard
Hazard Statements
H302 Harmful if swallowed
H314 Causes severe skin burns and eye damage
H317 May cause an allergic skin reaction
H318 Causes serious eye damage
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
Which trade and regulatory codes apply to 4,4'-methylenebis(cyclohexylamine)?
HS Code 29213000
UN Number 2928
ADR Class 6.1
Packing Group II
Storage Class 8A - Combustible corrosive hazardous materials
WGK (Germany) 2